Adding upstream version 2.4.57.upstream/2.4.57

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1174 insertions, 0 deletions

diff --git a/modules/ssl/ssl_private.h b/modules/ssl/ssl_private.h
new file mode 100644
index 0000000..cd8df07
--- /dev/null
+++ b/modules/ssl/ssl_private.h
@@ -0,0 +1,1174 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SSL_PRIVATE_H
+#define SSL_PRIVATE_H
+
+/**
+ * @file  ssl_private.h
+ * @brief Internal interfaces private to mod_ssl.
+ *
+ * @defgroup MOD_SSL_PRIVATE Private
+ * @ingroup MOD_SSL
+ * @{
+ */
+
+/** Apache headers */
+#include "ap_config.h"
+#include "httpd.h"
+#include "http_config.h"
+#include "http_core.h"
+#include "http_log.h"
+#include "http_main.h"
+#include "http_connection.h"
+#include "http_request.h"
+#include "http_protocol.h"
+#include "http_ssl.h"
+#include "http_vhost.h"
+#include "util_script.h"
+#include "util_filter.h"
+#include "util_ebcdic.h"
+#include "util_mutex.h"
+#include "apr.h"
+#include "apr_strings.h"
+#define APR_WANT_STRFUNC
+#define APR_WANT_MEMFUNC
+#include "apr_want.h"
+#include "apr_tables.h"
+#include "apr_lib.h"
+#include "apr_fnmatch.h"
+#include "apr_strings.h"
+#include "apr_global_mutex.h"
+#include "apr_optional.h"
+#include "ap_socache.h"
+#include "mod_auth.h"
+
+/* The #ifdef macros are only defined AFTER including the above
+ * therefore we cannot include these system files at the top  :-(
+ */
+#if APR_HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+#if APR_HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#if APR_HAVE_UNISTD_H
+#include <unistd.h> /* needed for STDIN_FILENO et.al., at least on FreeBSD */
+#endif
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#ifndef TRUE
+#define TRUE !FALSE
+#endif
+
+#ifndef BOOL
+#define BOOL unsigned int
+#endif
+
+#include "ap_expr.h"
+
+/* OpenSSL headers */
+#include <openssl/opensslv.h>
+#if (OPENSSL_VERSION_NUMBER >= 0x10001000)
+/* must be defined before including ssl.h */
+#define OPENSSL_NO_SSL_INTERN
+#endif
+#if OPENSSL_VERSION_NUMBER >= 0x30000000
+#include <openssl/core_names.h>
+#endif
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+#include <openssl/x509.h>
+#include <openssl/pem.h>
+#include <openssl/crypto.h>
+#include <openssl/evp.h>
+#include <openssl/rand.h>
+#include <openssl/x509v3.h>
+#include <openssl/x509_vfy.h>
+#include <openssl/ocsp.h>
+
+/* Avoid tripping over an engine build installed globally and detected
+ * when the user points at an explicit non-engine flavor of OpenSSL
+ */
+#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
+#include <openssl/engine.h>
+#endif
+
+#if (OPENSSL_VERSION_NUMBER < 0x0090801f)
+#error mod_ssl requires OpenSSL 0.9.8a or later
+#endif
+
+/**
+ * ...shifting sands of OpenSSL...
+ * Note: when adding support for new OpenSSL features, avoid explicit
+ * version number checks whenever possible, and use "feature-based"
+ * detection instead (check for definitions of constants or functions)
+ */
+#if (OPENSSL_VERSION_NUMBER >= 0x10000000)
+#define MODSSL_SSL_CIPHER_CONST const
+#define MODSSL_SSL_METHOD_CONST const
+#else
+#define MODSSL_SSL_CIPHER_CONST
+#define MODSSL_SSL_METHOD_CONST
+#endif
+
+#if defined(LIBRESSL_VERSION_NUMBER)
+/* Missing from LibreSSL */
+#if LIBRESSL_VERSION_NUMBER < 0x2060000f
+#define SSL_CTRL_SET_MIN_PROTO_VERSION          123
+#define SSL_CTRL_SET_MAX_PROTO_VERSION          124
+#define SSL_CTX_set_min_proto_version(ctx, version) \
+        SSL_CTX_ctrl(ctx, SSL_CTRL_SET_MIN_PROTO_VERSION, version, NULL)
+#define SSL_CTX_set_max_proto_version(ctx, version) \
+        SSL_CTX_ctrl(ctx, SSL_CTRL_SET_MAX_PROTO_VERSION, version, NULL)
+#endif /* LIBRESSL_VERSION_NUMBER < 0x2060000f */
+/* LibreSSL before 2.7 declares OPENSSL_VERSION_NUMBER == 2.0 but does not
+ * include most changes from OpenSSL >= 1.1 (new functions, macros, 
+ * deprecations, ...), so we have to work around this...
+ */
+#define MODSSL_USE_OPENSSL_PRE_1_1_API (LIBRESSL_VERSION_NUMBER < 0x2070000f)
+#else /* defined(LIBRESSL_VERSION_NUMBER) */
+#define MODSSL_USE_OPENSSL_PRE_1_1_API (OPENSSL_VERSION_NUMBER < 0x10100000L)
+#endif
+
+#if defined(OPENSSL_FIPS) || OPENSSL_VERSION_NUMBER >= 0x30000000L
+#define HAVE_FIPS
+#endif
+
+#if defined(SSL_OP_NO_TLSv1_2)
+#define HAVE_TLSV1_X
+#endif
+
+#if defined(SSL_CONF_FLAG_FILE)
+#define HAVE_SSL_CONF_CMD
+#endif
+
+/* session id constness */
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+#define IDCONST
+#else
+#define IDCONST const
+#endif
+
+/**
+  * The following features all depend on TLS extension support.
+  * Within this block, check again for features (not version numbers).
+  */
+#if !defined(OPENSSL_NO_TLSEXT) && defined(SSL_set_tlsext_host_name)
+
+#define HAVE_TLSEXT
+
+/* ECC: make sure we have at least 1.0.0 */
+#if !defined(OPENSSL_NO_EC) && defined(TLSEXT_ECPOINTFORMAT_uncompressed)
+#define HAVE_ECC
+#endif
+
+/* OCSP stapling */
+#if !defined(OPENSSL_NO_OCSP) && defined(SSL_CTX_set_tlsext_status_cb)
+#define HAVE_OCSP_STAPLING
+/* All exist but are no longer macros since OpenSSL 1.1.0 */
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
+/* backward compatibility with OpenSSL < 1.0 */
+#ifndef sk_OPENSSL_STRING_num
+#define sk_OPENSSL_STRING_num sk_num
+#endif
+#ifndef sk_OPENSSL_STRING_value
+#define sk_OPENSSL_STRING_value sk_value
+#endif
+#ifndef sk_OPENSSL_STRING_pop
+#define sk_OPENSSL_STRING_pop sk_pop
+#endif
+#endif /* if OPENSSL_VERSION_NUMBER < 0x10100000L */
+#endif /* if !defined(OPENSSL_NO_OCSP) && defined(SSL_CTX_set_tlsext_status_cb) */
+
+/* TLS session tickets */
+#if defined(SSL_CTX_set_tlsext_ticket_key_cb)
+#define HAVE_TLS_SESSION_TICKETS
+#define TLSEXT_TICKET_KEY_LEN 48
+#ifndef tlsext_tick_md
+#ifdef OPENSSL_NO_SHA256
+#define tlsext_tick_md EVP_sha1
+#else
+#define tlsext_tick_md EVP_sha256
+#endif
+#endif
+#endif
+
+/* Secure Remote Password */
+#if !defined(OPENSSL_NO_SRP) && defined(SSL_CTRL_SET_TLS_EXT_SRP_USERNAME_CB)
+#define HAVE_SRP
+#include <openssl/srp.h>
+#endif
+
+/* ALPN Protocol Negotiation */
+#if defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
+#define HAVE_TLS_ALPN
+#endif
+
+#endif /* !defined(OPENSSL_NO_TLSEXT) && defined(SSL_set_tlsext_host_name) */
+
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+#define BN_get_rfc2409_prime_768   get_rfc2409_prime_768
+#define BN_get_rfc2409_prime_1024  get_rfc2409_prime_1024
+#define BN_get_rfc3526_prime_1536  get_rfc3526_prime_1536
+#define BN_get_rfc3526_prime_2048  get_rfc3526_prime_2048
+#define BN_get_rfc3526_prime_3072  get_rfc3526_prime_3072
+#define BN_get_rfc3526_prime_4096  get_rfc3526_prime_4096
+#define BN_get_rfc3526_prime_6144  get_rfc3526_prime_6144
+#define BN_get_rfc3526_prime_8192  get_rfc3526_prime_8192
+#define BIO_set_init(x,v)          (x->init=v)
+#define BIO_get_data(x)            (x->ptr)
+#define BIO_set_data(x,v)          (x->ptr=v)
+#define BIO_get_shutdown(x)        (x->shutdown)
+#define BIO_set_shutdown(x,v)      (x->shutdown=v)
+#define DH_bits(x)                 (BN_num_bits(x->p))
+#else
+void init_bio_methods(void);
+void free_bio_methods(void);
+#endif
+
+#if OPENSSL_VERSION_NUMBER < 0x10002000L || \
+	(defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x2070000f)
+#define X509_STORE_CTX_get0_store(x) (x->ctx)
+#endif
+
+#if OPENSSL_VERSION_NUMBER < 0x10000000L
+#ifndef X509_STORE_CTX_get0_current_issuer
+#define X509_STORE_CTX_get0_current_issuer(x) (x->current_issuer)
+#endif
+#endif
+
+#if OPENSSL_VERSION_NUMBER >= 0x10101000L && !defined(LIBRESSL_VERSION_NUMBER)
+#define HAVE_OPENSSL_KEYLOG
+#endif
+
+#ifdef HAVE_FIPS
+#if OPENSSL_VERSION_NUMBER >= 0x30000000L
+#define modssl_fips_is_enabled() EVP_default_properties_is_fips_enabled(NULL)
+#define modssl_fips_enable(to)   EVP_default_properties_enable_fips(NULL, (to))
+#else
+#define modssl_fips_is_enabled() FIPS_mode()
+#define modssl_fips_enable(to)   FIPS_mode_set((to))
+#endif
+#endif /* HAVE_FIPS */
+
+/* mod_ssl headers */
+#include "ssl_util_ssl.h"
+
+APLOG_USE_MODULE(ssl);
+
+/*
+ * Provide reasonable default for some defines
+ */
+#ifndef PFALSE
+#define PFALSE ((void *)FALSE)
+#endif
+#ifndef PTRUE
+#define PTRUE ((void *)TRUE)
+#endif
+#ifndef UNSET
+#define UNSET (-1)
+#endif
+#ifndef NUL
+#define NUL '\0'
+#endif
+#ifndef RAND_MAX
+#include <limits.h>
+#define RAND_MAX INT_MAX
+#endif
+
+/**
+ * Provide reasonable defines for some types
+ */
+#ifndef UCHAR
+#define UCHAR unsigned char
+#endif
+
+/**
+ * Provide useful shorthands
+ */
+#define strEQ(s1,s2)     (strcmp(s1,s2)        == 0)
+#define strNE(s1,s2)     (strcmp(s1,s2)        != 0)
+#define strEQn(s1,s2,n)  (strncmp(s1,s2,n)     == 0)
+#define strNEn(s1,s2,n)  (strncmp(s1,s2,n)     != 0)
+
+#define strcEQ(s1,s2)    (strcasecmp(s1,s2)    == 0)
+#define strcNE(s1,s2)    (strcasecmp(s1,s2)    != 0)
+#define strcEQn(s1,s2,n) (strncasecmp(s1,s2,n) == 0)
+#define strcNEn(s1,s2,n) (strncasecmp(s1,s2,n) != 0)
+
+#define strIsEmpty(s)    (s == NULL || s[0] == NUL)
+
+#define myConnConfig(c) \
+    ((SSLConnRec *)ap_get_module_config(c->conn_config, &ssl_module))
+#define myConnConfigSet(c, val) \
+    ap_set_module_config(c->conn_config, &ssl_module, val)
+#define mySrvConfig(srv) \
+    ((SSLSrvConfigRec *)ap_get_module_config(srv->module_config,  &ssl_module))
+#define myDirConfig(req) \
+    ((SSLDirConfigRec *)ap_get_module_config(req->per_dir_config, &ssl_module))
+#define myConnCtxConfig(c, sc) \
+    (c->outgoing ? myConnConfig(c)->dc->proxy : sc->server)
+#define myModConfig(srv) mySrvConfig((srv))->mc
+#define mySrvFromConn(c) myConnConfig(c)->server
+#define myDirConfigFromConn(c) myConnConfig(c)->dc
+#define mySrvConfigFromConn(c) mySrvConfig(mySrvFromConn(c))
+#define myModConfigFromConn(c) myModConfig(mySrvFromConn(c))
+
+/**
+ * Defaults for the configuration
+ */
+#ifndef SSL_SESSION_CACHE_TIMEOUT
+#define SSL_SESSION_CACHE_TIMEOUT  300
+#endif
+
+/* Default setting for per-dir reneg buffer. */
+#ifndef DEFAULT_RENEG_BUFFER_SIZE
+#define DEFAULT_RENEG_BUFFER_SIZE (128 * 1024)
+#endif
+
+/* Default for OCSP response validity */
+#ifndef DEFAULT_OCSP_MAX_SKEW
+#define DEFAULT_OCSP_MAX_SKEW (60 * 5)
+#endif
+
+/* Default timeout for OCSP queries */
+#ifndef DEFAULT_OCSP_TIMEOUT
+#define DEFAULT_OCSP_TIMEOUT 10
+#endif
+
+/*
+ * For better backwards compatibility with the SSLCertificate[Key]File
+ * and SSLPassPhraseDialog ("exec" type) directives in 2.4.7 and earlier
+ */
+#ifdef HAVE_ECC
+#define CERTKEYS_IDX_MAX 2
+#else
+#define CERTKEYS_IDX_MAX 1
+#endif
+
+/**
+ * Define the SSL options
+ */
+#define SSL_OPT_NONE           (0)
+#define SSL_OPT_RELSET         (1<<0)
+#define SSL_OPT_STDENVVARS     (1<<1)
+#define SSL_OPT_EXPORTCERTDATA (1<<3)
+#define SSL_OPT_FAKEBASICAUTH  (1<<4)
+#define SSL_OPT_STRICTREQUIRE  (1<<5)
+#define SSL_OPT_OPTRENEGOTIATE (1<<6)
+#define SSL_OPT_LEGACYDNFORMAT (1<<7)
+typedef int ssl_opt_t;
+
+/**
+ * Define the SSL Protocol options
+ */
+#define SSL_PROTOCOL_NONE  (0)
+#ifndef OPENSSL_NO_SSL3
+#define SSL_PROTOCOL_SSLV3 (1<<1)
+#endif
+#define SSL_PROTOCOL_TLSV1 (1<<2)
+#ifndef OPENSSL_NO_SSL3
+#define SSL_PROTOCOL_BASIC (SSL_PROTOCOL_SSLV3|SSL_PROTOCOL_TLSV1)
+#else
+#define SSL_PROTOCOL_BASIC (SSL_PROTOCOL_TLSV1)
+#endif
+#ifdef HAVE_TLSV1_X
+#define SSL_PROTOCOL_TLSV1_1 (1<<3)
+#define SSL_PROTOCOL_TLSV1_2 (1<<4)
+#define SSL_PROTOCOL_TLSV1_3 (1<<5)
+
+#ifdef SSL_OP_NO_TLSv1_3
+#define SSL_HAVE_PROTOCOL_TLSV1_3   (1)
+#define SSL_PROTOCOL_ALL   (SSL_PROTOCOL_BASIC| \
+                            SSL_PROTOCOL_TLSV1_1|SSL_PROTOCOL_TLSV1_2|SSL_PROTOCOL_TLSV1_3)
+#else
+#define SSL_HAVE_PROTOCOL_TLSV1_3   (0)
+#define SSL_PROTOCOL_ALL   (SSL_PROTOCOL_BASIC| \
+                            SSL_PROTOCOL_TLSV1_1|SSL_PROTOCOL_TLSV1_2)
+#endif
+#else
+#define SSL_PROTOCOL_ALL   (SSL_PROTOCOL_BASIC)
+#endif
+#ifndef OPENSSL_NO_SSL3
+#define SSL_PROTOCOL_DEFAULT (SSL_PROTOCOL_ALL & ~SSL_PROTOCOL_SSLV3)
+#else
+#define SSL_PROTOCOL_DEFAULT (SSL_PROTOCOL_ALL)
+#endif
+typedef int ssl_proto_t;
+
+/**
+ * Define the SSL verify levels
+ */
+typedef enum {
+    SSL_CVERIFY_UNSET           = UNSET,
+    SSL_CVERIFY_NONE            = 0,
+    SSL_CVERIFY_OPTIONAL        = 1,
+    SSL_CVERIFY_REQUIRE         = 2,
+    SSL_CVERIFY_OPTIONAL_NO_CA  = 3
+} ssl_verify_t;
+
+#define SSL_VERIFY_PEER_STRICT \
+     (SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
+
+#define ssl_verify_error_is_optional(errnum) \
+   ((errnum == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT) \
+    || (errnum == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN) \
+    || (errnum == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY) \
+    || (errnum == X509_V_ERR_CERT_UNTRUSTED) \
+    || (errnum == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE))
+
+/**
+  * CRL checking mask (mode | flags)
+  */
+typedef enum {
+    SSL_CRLCHECK_NONE  = (0),
+    SSL_CRLCHECK_LEAF  = (1 << 0),
+    SSL_CRLCHECK_CHAIN = (1 << 1),
+
+#define SSL_CRLCHECK_FLAGS (~0x3)
+    SSL_CRLCHECK_NO_CRL_FOR_CERT_OK = (1 << 2)
+} ssl_crlcheck_t;
+
+/**
+  * OCSP checking mask (mode | flags)
+  */
+typedef enum {
+    SSL_OCSPCHECK_NONE  = (0),
+    SSL_OCSPCHECK_LEAF  = (1 << 0),
+    SSL_OCSPCHECK_CHAIN = (1 << 1),
+    SSL_OCSPCHECK_NO_OCSP_FOR_CERT_OK = (1 << 2)
+} ssl_ocspcheck_t;
+
+/**
+ * Define the SSL pass phrase dialog types
+ */
+typedef enum {
+    SSL_PPTYPE_UNSET   = UNSET,
+    SSL_PPTYPE_BUILTIN = 0,
+    SSL_PPTYPE_FILTER  = 1,
+    SSL_PPTYPE_PIPE    = 2
+} ssl_pphrase_t;
+
+/**
+ * Define the Path Checking modes
+ */
+#define SSL_PCM_EXISTS     1
+#define SSL_PCM_ISREG      2
+#define SSL_PCM_ISDIR      4
+#define SSL_PCM_ISNONZERO  8
+typedef unsigned int ssl_pathcheck_t;
+
+/**
+ * Define the SSL enabled state
+ */
+typedef enum {
+    SSL_ENABLED_UNSET    = UNSET,
+    SSL_ENABLED_FALSE    = 0,
+    SSL_ENABLED_TRUE     = 1,
+    SSL_ENABLED_OPTIONAL = 3
+} ssl_enabled_t;
+
+/**
+ * Define the SSL requirement structure
+ */
+typedef struct {
+    const char     *cpExpr;
+    ap_expr_info_t *mpExpr;
+} ssl_require_t;
+
+/**
+ * Define the SSL random number generator seeding source
+ */
+typedef enum {
+    SSL_RSCTX_STARTUP = 1,
+    SSL_RSCTX_CONNECT = 2
+} ssl_rsctx_t;
+typedef enum {
+    SSL_RSSRC_BUILTIN = 1,
+    SSL_RSSRC_FILE    = 2,
+    SSL_RSSRC_EXEC    = 3,
+    SSL_RSSRC_EGD     = 4
+} ssl_rssrc_t;
+typedef struct {
+    ssl_rsctx_t  nCtx;
+    ssl_rssrc_t  nSrc;
+    char        *cpPath;
+    int          nBytes;
+} ssl_randseed_t;
+
+/**
+ * Define the structure of an ASN.1 anything
+ */
+typedef struct {
+    long int       nData;
+    unsigned char *cpData;
+    apr_time_t     source_mtime;
+} ssl_asn1_t;
+
+/**
+ * Define the mod_ssl per-module configuration structure
+ * (i.e. the global configuration for each httpd process)
+ */
+
+typedef struct SSLSrvConfigRec SSLSrvConfigRec;
+typedef struct SSLDirConfigRec SSLDirConfigRec;
+
+typedef enum {
+    SSL_SHUTDOWN_TYPE_UNSET,
+    SSL_SHUTDOWN_TYPE_STANDARD,
+    SSL_SHUTDOWN_TYPE_UNCLEAN,
+    SSL_SHUTDOWN_TYPE_ACCURATE
+} ssl_shutdown_type_e;
+
+typedef struct {
+    SSL *ssl;
+    const char *client_dn;
+    X509 *client_cert;
+    ssl_shutdown_type_e shutdown_type;
+    const char *verify_info;
+    const char *verify_error;
+    int verify_depth;
+    int disabled;
+    enum {
+        NON_SSL_OK = 0,        /* is SSL request, or error handling completed */
+        NON_SSL_SEND_REQLINE,  /* Need to send the fake request line */
+        NON_SSL_SEND_HDR_SEP,  /* Need to send the header separator */
+        NON_SSL_SET_ERROR_MSG  /* Need to set the error message */
+    } non_ssl_request;
+
+    /* Track the handshake/renegotiation state for the connection so
+     * that all client-initiated renegotiations can be rejected, as a
+     * partial fix for CVE-2009-3555. */
+    enum {
+        RENEG_INIT = 0, /* Before initial handshake */
+        RENEG_REJECT,   /* After initial handshake; any client-initiated
+                         * renegotiation should be rejected */
+        RENEG_ALLOW,    /* A server-initiated renegotiation is taking
+                         * place (as dictated by configuration) */
+        RENEG_ABORT     /* Renegotiation initiated by client, abort the
+                         * connection */
+    } reneg_state;
+
+    server_rec *server;
+    SSLDirConfigRec *dc;
+    
+    const char *cipher_suite; /* cipher suite used in last reneg */
+    int service_unavailable;  /* thouugh we negotiate SSL, no requests will be served */
+    int vhost_found;          /* whether we found vhost from SNI already */
+} SSLConnRec;
+
+/* BIG FAT WARNING: SSLModConfigRec has unusual memory lifetime: it is
+ * allocated out of the "process" pool and only a single such
+ * structure is created and used for the lifetime of the process.
+ * (The process pool is s->process->pool and is stored in the .pPool
+ * field.)  Most members of this structure are likewise allocated out
+ * of the process pool, but notably sesscache and sesscache_context
+ * are not.
+ *
+ * The structure is treated as mostly immutable after a single config
+ * parse has completed; the post_config hook (ssl_init_Module) flips
+ * the bFixed flag to true and subsequent invocations of the config
+ * callbacks hence do nothing.
+ *
+ * This odd lifetime strategy is used so that encrypted private keys
+ * can be decrypted once at startup and continue to be used across
+ * subsequent server reloads where the interactive password prompt is
+ * not possible.
+
+ * It is really an ABI nightmare waiting to happen since DSOs are
+ * reloaded across restarts, and nothing prevents the struct type
+ * changing across such reloads, yet the cached structure will be
+ * assumed to match regardless.
+ *
+ * This should really be fixed using a smaller structure which only
+ * stores that which is absolutely necessary (the private keys, maybe
+ * the random seed), and have that structure be strictly ABI-versioned
+ * for safety.
+ */
+typedef struct {
+    pid_t           pid;
+    apr_pool_t     *pPool;
+    BOOL            bFixed;
+
+    /* OpenSSL SSL_SESS_CACHE_* flags: */
+    long            sesscache_mode;
+
+    /* The configured provider, and associated private data
+     * structure. */
+    const ap_socache_provider_t *sesscache;
+    ap_socache_instance_t *sesscache_context;
+
+    apr_global_mutex_t   *pMutex;
+    apr_array_header_t   *aRandSeed;
+    apr_hash_t     *tVHostKeys;
+
+    /* A hash table of pointers to ssl_asn1_t structures.  The structures
+     * are used to store private keys in raw DER format (serialized OpenSSL
+     * PrivateKey structures).  The table is indexed by (vhost-id,
+     * index), for example the string "vhost.example.com:443:0". */
+    apr_hash_t     *tPrivateKey;
+
+#if defined(HAVE_OPENSSL_ENGINE_H) && defined(HAVE_ENGINE_INIT)
+    const char     *szCryptoDevice;
+#endif
+
+#ifdef HAVE_OCSP_STAPLING
+    const ap_socache_provider_t *stapling_cache;
+    ap_socache_instance_t *stapling_cache_context;
+    apr_global_mutex_t   *stapling_cache_mutex;
+    apr_global_mutex_t   *stapling_refresh_mutex;
+#endif
+#ifdef HAVE_OPENSSL_KEYLOG
+    /* Used for logging if SSLKEYLOGFILE is set at startup. */
+    apr_file_t      *keylog_file;
+#endif
+
+#ifdef HAVE_FIPS
+    BOOL             fips;
+#endif
+} SSLModConfigRec;
+
+/** Structure representing configured filenames for certs and keys for
+ * a given vhost */
+typedef struct {
+    /* Lists of configured certs and keys for this server */
+    apr_array_header_t *cert_files;
+    apr_array_header_t *key_files;
+
+    /** Certificates which specify the set of CA names which should be
+     * sent in the CertificateRequest message: */
+    const char  *ca_name_path;
+    const char  *ca_name_file;
+    
+    /* TLS service for this server is suspended */
+    int service_unavailable;
+} modssl_pk_server_t;
+
+typedef struct {
+    /** proxy can have any number of cert/key pairs */
+    const char  *cert_file;
+    const char  *cert_path;
+    const char  *ca_cert_file;
+    /* certs is a stack of configured cert, key pairs. */
+    STACK_OF(X509_INFO) *certs;
+    /* ca_certs contains ONLY chain certs for each item in certs.
+     * ca_certs[n] is a pointer to the (STACK_OF(X509) *) stack which
+     * holds the cert chain for the 'n'th cert in the certs stack, or
+     * NULL if no chain is configured. */
+    STACK_OF(X509) **ca_certs;
+} modssl_pk_proxy_t;
+
+/** stuff related to authentication that can also be per-dir */
+typedef struct {
+    /** known/trusted CAs */
+    const char  *ca_cert_path;
+    const char  *ca_cert_file;
+
+    const char  *cipher_suite;
+
+    /** for client or downstream server authentication */
+    int          verify_depth;
+    ssl_verify_t verify_mode;
+
+    /** TLSv1.3 has its separate cipher list, separate from the
+     settings for older TLS protocol versions. Since which one takes
+     effect is a matter of negotiation, we need separate settings */
+    const char  *tls13_ciphers;
+} modssl_auth_ctx_t;
+
+#ifdef HAVE_TLS_SESSION_TICKETS
+typedef struct {
+    const char *file_path;
+    unsigned char key_name[16];
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+    unsigned char hmac_secret[16];
+#else
+    OSSL_PARAM mac_params[3];
+#endif
+    unsigned char aes_key[16];
+} modssl_ticket_key_t;
+#endif
+
+#ifdef HAVE_SSL_CONF_CMD
+typedef struct {
+    const char *name;
+    const char *value;
+} ssl_ctx_param_t;
+#endif
+
+typedef struct {
+    SSLSrvConfigRec *sc; /** pointer back to server config */
+    SSL_CTX *ssl_ctx;
+
+    /** we are one or the other */
+    modssl_pk_server_t *pks;
+    modssl_pk_proxy_t  *pkp;
+
+#ifdef HAVE_TLS_SESSION_TICKETS
+    modssl_ticket_key_t *ticket_key;
+#endif
+
+    ssl_proto_t  protocol;
+    int protocol_set;
+
+    /** config for handling encrypted keys */
+    ssl_pphrase_t pphrase_dialog_type;
+    const char   *pphrase_dialog_path;
+
+    const char  *cert_chain;
+
+    /** certificate revocation list */
+    const char    *crl_path;
+    const char    *crl_file;
+    int            crl_check_mask;
+
+#ifdef HAVE_OCSP_STAPLING
+    /** OCSP stapling options */
+    BOOL        stapling_enabled;
+    long        stapling_resptime_skew;
+    long        stapling_resp_maxage;
+    int         stapling_cache_timeout;
+    BOOL        stapling_return_errors;
+    BOOL        stapling_fake_trylater;
+    int         stapling_errcache_timeout;
+    apr_interval_time_t stapling_responder_timeout;
+    const char *stapling_force_url;
+#endif
+
+#ifdef HAVE_SRP
+    char *srp_vfile;
+    char *srp_unknown_user_seed;
+    SRP_VBASE  *srp_vbase;
+#endif
+
+    modssl_auth_ctx_t auth;
+
+    int ocsp_mask;
+    BOOL ocsp_force_default; /* true if the default responder URL is
+                              * used regardless of per-cert URL */
+    const char *ocsp_responder; /* default responder URL */
+    long ocsp_resptime_skew;
+    long ocsp_resp_maxage;
+    apr_interval_time_t ocsp_responder_timeout;
+    BOOL ocsp_use_request_nonce;
+    apr_uri_t *proxy_uri;
+
+    BOOL ocsp_noverify; /* true if skipping OCSP certification verification like openssl -noverify */
+    /* Declare variables for using OCSP Responder Certs for OCSP verification */
+    int ocsp_verify_flags; /* Flags to use when verifying OCSP response */
+    const char *ocsp_certs_file; /* OCSP other certificates filename */
+    STACK_OF(X509) *ocsp_certs; /* OCSP other certificates */
+
+#ifdef HAVE_SSL_CONF_CMD
+    SSL_CONF_CTX *ssl_ctx_config; /* Configuration context */
+    apr_array_header_t *ssl_ctx_param; /* parameters to pass to SSL_CTX */
+#endif
+
+    BOOL ssl_check_peer_cn;
+    BOOL ssl_check_peer_name;
+    BOOL ssl_check_peer_expire;
+} modssl_ctx_t;
+
+struct SSLSrvConfigRec {
+    SSLModConfigRec *mc;
+    ssl_enabled_t    enabled;
+    const char      *vhost_id;
+    int              vhost_id_len;
+    int              session_cache_timeout;
+    BOOL             cipher_server_pref;
+    BOOL             insecure_reneg;
+    modssl_ctx_t    *server;
+#ifdef HAVE_TLSEXT
+    ssl_enabled_t    strict_sni_vhost_check;
+#endif
+#ifndef OPENSSL_NO_COMP
+    BOOL             compression;
+#endif
+    BOOL             session_tickets;
+};
+
+/**
+ * Define the mod_ssl per-directory configuration structure
+ * (i.e. the local configuration for all &lt;Directory>
+ *  and .htaccess contexts)
+ */
+struct SSLDirConfigRec {
+    BOOL          bSSLRequired;
+    apr_array_header_t *aRequirement;
+    ssl_opt_t     nOptions;
+    ssl_opt_t     nOptionsAdd;
+    ssl_opt_t     nOptionsDel;
+    const char   *szCipherSuite;
+    ssl_verify_t  nVerifyClient;
+    int           nVerifyDepth;
+    const char   *szUserName;
+    apr_size_t    nRenegBufferSize;
+
+    modssl_ctx_t *proxy;
+    BOOL          proxy_enabled;
+    BOOL          proxy_post_config;
+};
+
+/**
+ *  function prototypes
+ */
+
+/**  API glue structures  */
+extern module AP_MODULE_DECLARE_DATA ssl_module;
+
+/**  configuration handling   */
+SSLModConfigRec *ssl_config_global_create(server_rec *);
+void         ssl_config_global_fix(SSLModConfigRec *);
+BOOL         ssl_config_global_isfixed(SSLModConfigRec *);
+void        *ssl_config_server_create(apr_pool_t *, server_rec *);
+void        *ssl_config_server_merge(apr_pool_t *, void *, void *);
+void        *ssl_config_perdir_create(apr_pool_t *, char *);
+void        *ssl_config_perdir_merge(apr_pool_t *, void *, void *);
+void         ssl_config_proxy_merge(apr_pool_t *,
+                                    SSLDirConfigRec *, SSLDirConfigRec *);
+const char  *ssl_cmd_SSLPassPhraseDialog(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCryptoDevice(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLRandomSeed(cmd_parms *, void *, const char *, const char *, const char *);
+const char  *ssl_cmd_SSLEngine(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCipherSuite(cmd_parms *, void *, const char *, const char *);
+const char  *ssl_cmd_SSLCertificateFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCertificateKeyFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCertificateChainFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCACertificatePath(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCACertificateFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCADNRequestPath(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCADNRequestFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCARevocationPath(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCARevocationFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLCARevocationCheck(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLHonorCipherOrder(cmd_parms *cmd, void *dcfg, int flag);
+const char  *ssl_cmd_SSLCompression(cmd_parms *, void *, int flag);
+const char  *ssl_cmd_SSLSessionTickets(cmd_parms *, void *, int flag);
+const char  *ssl_cmd_SSLVerifyClient(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLVerifyDepth(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLSessionCache(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLSessionCacheTimeout(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProtocol(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLOptions(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLRequireSSL(cmd_parms *, void *);
+const char  *ssl_cmd_SSLRequire(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLUserName(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLRenegBufferSize(cmd_parms *cmd, void *dcfg, const char *arg);
+const char  *ssl_cmd_SSLStrictSNIVHostCheck(cmd_parms *cmd, void *dcfg, int flag);
+const char *ssl_cmd_SSLInsecureRenegotiation(cmd_parms *cmd, void *dcfg, int flag);
+
+const char  *ssl_cmd_SSLProxyEngine(cmd_parms *cmd, void *dcfg, int flag);
+const char  *ssl_cmd_SSLProxyProtocol(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyCipherSuite(cmd_parms *, void *, const char *, const char *);
+const char  *ssl_cmd_SSLProxyVerify(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyVerifyDepth(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyCACertificatePath(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyCACertificateFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyCARevocationPath(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyCARevocationFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyCARevocationCheck(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyMachineCertificatePath(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyMachineCertificateFile(cmd_parms *, void *, const char *);
+const char  *ssl_cmd_SSLProxyMachineCertificateChainFile(cmd_parms *, void *, const char *);
+#ifdef HAVE_TLS_SESSION_TICKETS
+const char *ssl_cmd_SSLSessionTicketKeyFile(cmd_parms *cmd, void *dcfg, const char *arg);
+#endif
+const char  *ssl_cmd_SSLProxyCheckPeerExpire(cmd_parms *cmd, void *dcfg, int flag);
+const char  *ssl_cmd_SSLProxyCheckPeerCN(cmd_parms *cmd, void *dcfg, int flag);
+const char  *ssl_cmd_SSLProxyCheckPeerName(cmd_parms *cmd, void *dcfg, int flag);
+
+const char *ssl_cmd_SSLOCSPOverrideResponder(cmd_parms *cmd, void *dcfg, int flag);
+const char *ssl_cmd_SSLOCSPDefaultResponder(cmd_parms *cmd, void *dcfg, const char *arg);
+const char *ssl_cmd_SSLOCSPResponseTimeSkew(cmd_parms *cmd, void *dcfg, const char *arg);
+const char *ssl_cmd_SSLOCSPResponseMaxAge(cmd_parms *cmd, void *dcfg, const char *arg);
+const char *ssl_cmd_SSLOCSPResponderTimeout(cmd_parms *cmd, void *dcfg, const char *arg);
+const char *ssl_cmd_SSLOCSPUseRequestNonce(cmd_parms *cmd, void *dcfg, int flag);
+const char *ssl_cmd_SSLOCSPEnable(cmd_parms *cmd, void *dcfg, const char *arg);
+const char *ssl_cmd_SSLOCSPProxyURL(cmd_parms *cmd, void *dcfg, const char *arg);
+
+/* Declare OCSP Responder Certificate Verification Directive */
+const char *ssl_cmd_SSLOCSPNoVerify(cmd_parms *cmd, void *dcfg, int flag);
+/* Declare OCSP Responder Certificate File Directive */
+const char *ssl_cmd_SSLOCSPResponderCertificateFile(cmd_parms *cmd, void *dcfg, const char *arg);
+
+#ifdef HAVE_SSL_CONF_CMD
+const char *ssl_cmd_SSLOpenSSLConfCmd(cmd_parms *cmd, void *dcfg, const char *arg1, const char *arg2);
+#endif
+
+#ifdef HAVE_SRP
+const char *ssl_cmd_SSLSRPVerifierFile(cmd_parms *cmd, void *dcfg, const char *arg);
+const char *ssl_cmd_SSLSRPUnknownUserSeed(cmd_parms *cmd, void *dcfg, const char *arg);
+#endif
+
+const char *ssl_cmd_SSLFIPS(cmd_parms *cmd, void *dcfg, int flag);
+
+/**  module initialization  */
+apr_status_t ssl_init_Module(apr_pool_t *, apr_pool_t *, apr_pool_t *, server_rec *);
+apr_status_t ssl_init_Engine(server_rec *, apr_pool_t *);
+apr_status_t ssl_init_ConfigureServer(server_rec *, apr_pool_t *, apr_pool_t *, SSLSrvConfigRec *,
+                                      apr_array_header_t *);
+apr_status_t ssl_init_CheckServers(server_rec *, apr_pool_t *);
+int          ssl_proxy_section_post_config(apr_pool_t *p, apr_pool_t *plog,
+                                           apr_pool_t *ptemp, server_rec *s,
+                                           ap_conf_vector_t *section_config);
+STACK_OF(X509_NAME)
+            *ssl_init_FindCAList(server_rec *, apr_pool_t *, const char *, const char *);
+void         ssl_init_Child(apr_pool_t *, server_rec *);
+apr_status_t ssl_init_ModuleKill(void *data);
+
+/**  Apache API hooks  */
+int          ssl_hook_Auth(request_rec *);
+int          ssl_hook_UserCheck(request_rec *);
+int          ssl_hook_Access(request_rec *);
+int          ssl_hook_Fixup(request_rec *);
+int          ssl_hook_ReadReq(request_rec *);
+int          ssl_hook_Upgrade(request_rec *);
+void         ssl_hook_ConfigTest(apr_pool_t *pconf, server_rec *s);
+
+/** Apache authz provisders */
+extern const authz_provider ssl_authz_provider_require_ssl;
+extern const authz_provider ssl_authz_provider_verify_client;
+
+/**  OpenSSL callbacks */
+DH          *ssl_callback_TmpDH(SSL *, int, int);
+int          ssl_callback_SSLVerify(int, X509_STORE_CTX *);
+int          ssl_callback_SSLVerify_CRL(int, X509_STORE_CTX *, conn_rec *);
+int          ssl_callback_proxy_cert(SSL *ssl, X509 **x509, EVP_PKEY **pkey);
+int          ssl_callback_NewSessionCacheEntry(SSL *, SSL_SESSION *);
+SSL_SESSION *ssl_callback_GetSessionCacheEntry(SSL *, IDCONST unsigned char *, int, int *);
+void         ssl_callback_DelSessionCacheEntry(SSL_CTX *, SSL_SESSION *);
+void         ssl_callback_Info(const SSL *, int, int);
+#ifdef HAVE_TLSEXT
+int          ssl_callback_ServerNameIndication(SSL *, int *, modssl_ctx_t *);
+#endif
+#if OPENSSL_VERSION_NUMBER >= 0x10101000L && !defined(LIBRESSL_VERSION_NUMBER)
+int          ssl_callback_ClientHello(SSL *, int *, void *);
+#endif
+#ifdef HAVE_TLS_SESSION_TICKETS
+int ssl_callback_SessionTicket(SSL *ssl,
+                               unsigned char *keyname,
+                               unsigned char *iv,
+                               EVP_CIPHER_CTX *cipher_ctx,
+#if OPENSSL_VERSION_NUMBER < 0x30000000L
+                               HMAC_CTX *hmac_ctx,
+#else
+                               EVP_MAC_CTX *mac_ctx,
+#endif
+                               int mode);
+#endif
+
+#ifdef HAVE_TLS_ALPN
+int ssl_callback_alpn_select(SSL *ssl, const unsigned char **out,
+                             unsigned char *outlen, const unsigned char *in,
+                             unsigned int inlen, void *arg);
+#endif
+
+/**  Session Cache Support  */
+apr_status_t ssl_scache_init(server_rec *, apr_pool_t *);
+void         ssl_scache_status_register(apr_pool_t *p);
+void         ssl_scache_kill(server_rec *);
+BOOL         ssl_scache_store(server_rec *, IDCONST UCHAR *, int,
+                              apr_time_t, SSL_SESSION *, apr_pool_t *);
+SSL_SESSION *ssl_scache_retrieve(server_rec *, IDCONST UCHAR *, int, apr_pool_t *);
+void         ssl_scache_remove(server_rec *, IDCONST UCHAR *, int,
+                               apr_pool_t *);
+
+/** OCSP Stapling Support */
+#ifdef HAVE_OCSP_STAPLING
+const char *ssl_cmd_SSLStaplingCache(cmd_parms *, void *, const char *);
+const char *ssl_cmd_SSLUseStapling(cmd_parms *, void *, int);
+const char *ssl_cmd_SSLStaplingResponseTimeSkew(cmd_parms *, void *, const char *);
+const char *ssl_cmd_SSLStaplingResponseMaxAge(cmd_parms *, void *, const char *);
+const char *ssl_cmd_SSLStaplingStandardCacheTimeout(cmd_parms *, void *, const char *);
+const char *ssl_cmd_SSLStaplingErrorCacheTimeout(cmd_parms *, void *, const char *);
+const char *ssl_cmd_SSLStaplingReturnResponderErrors(cmd_parms *, void *, int);
+const char *ssl_cmd_SSLStaplingFakeTryLater(cmd_parms *, void *, int);
+const char *ssl_cmd_SSLStaplingResponderTimeout(cmd_parms *, void *, const char *);
+const char *ssl_cmd_SSLStaplingForceURL(cmd_parms *, void *, const char *);
+apr_status_t modssl_init_stapling(server_rec *, apr_pool_t *, apr_pool_t *, modssl_ctx_t *);
+void         ssl_stapling_certinfo_hash_init(apr_pool_t *);
+int          ssl_stapling_init_cert(server_rec *, apr_pool_t *, apr_pool_t *,
+                                    modssl_ctx_t *, X509 *);
+#endif
+#ifdef HAVE_SRP
+int          ssl_callback_SRPServerParams(SSL *, int *, void *);
+#endif
+
+#ifdef HAVE_OPENSSL_KEYLOG
+/* Callback used with SSL_CTX_set_keylog_callback. */
+void         modssl_callback_keylog(const SSL *ssl, const char *line);
+#endif
+
+/**  I/O  */
+void         ssl_io_filter_init(conn_rec *, request_rec *r, SSL *);
+void         ssl_io_filter_register(apr_pool_t *);
+long         ssl_io_data_cb(BIO *, int, const char *, int, long, long);
+
+/* ssl_io_buffer_fill fills the setaside buffering of the HTTP request
+ * to allow an SSL renegotiation to take place. */
+int          ssl_io_buffer_fill(request_rec *r, apr_size_t maxlen);
+
+/**  PRNG  */
+int          ssl_rand_seed(server_rec *, apr_pool_t *, ssl_rsctx_t, char *);
+
+/**  Utility Functions  */
+char        *ssl_util_vhostid(apr_pool_t *, server_rec *);
+apr_file_t  *ssl_util_ppopen(server_rec *, apr_pool_t *, const char *,
+                             const char * const *);
+void         ssl_util_ppclose(server_rec *, apr_pool_t *, apr_file_t *);
+char        *ssl_util_readfilter(server_rec *, apr_pool_t *, const char *,
+                                 const char * const *);
+BOOL         ssl_util_path_check(ssl_pathcheck_t, const char *, apr_pool_t *);
+#if APR_HAS_THREADS && MODSSL_USE_OPENSSL_PRE_1_1_API
+void         ssl_util_thread_setup(apr_pool_t *);
+void         ssl_util_thread_id_setup(apr_pool_t *);
+#endif
+int          ssl_init_ssl_connection(conn_rec *c, request_rec *r);
+
+BOOL         ssl_util_vhost_matches(const char *servername, server_rec *s);
+
+/**  Pass Phrase Support  */
+apr_status_t ssl_load_encrypted_pkey(server_rec *, apr_pool_t *, int,
+                                     const char *, apr_array_header_t **);
+
+/* Load public and/or private key from the configured ENGINE. Private
+ * key returned as *pkey.  certid can be NULL, in which case *pubkey
+ * is not altered.  Errors logged on failure. */
+apr_status_t modssl_load_engine_keypair(server_rec *s, apr_pool_t *p,
+                                        const char *vhostid,
+                                        const char *certid, const char *keyid,
+                                        X509 **pubkey, EVP_PKEY **privkey);
+
+/**  Diffie-Hellman Parameter Support  */
+DH           *ssl_dh_GetParamFromFile(const char *);
+#ifdef HAVE_ECC
+EC_GROUP     *ssl_ec_GetParamFromFile(const char *);
+#endif
+
+/* Store the EVP_PKEY key (serialized into DER) in the hash table with
+ * key, returning the ssl_asn1_t structure pointer. */
+ssl_asn1_t *ssl_asn1_table_set(apr_hash_t *table, const char *key,
+                               EVP_PKEY *pkey);
+/* Retrieve the ssl_asn1_t structure with given key from the hash. */
+ssl_asn1_t *ssl_asn1_table_get(apr_hash_t *table, const char *key);
+/* Remove and free the ssl_asn1_t structure with given key. */
+void ssl_asn1_table_unset(apr_hash_t *table, const char *key);
+
+/**  Mutex Support  */
+int          ssl_mutex_init(server_rec *, apr_pool_t *);
+int          ssl_mutex_reinit(server_rec *, apr_pool_t *);
+int          ssl_mutex_on(server_rec *);
+int          ssl_mutex_off(server_rec *);
+
+int          ssl_stapling_mutex_reinit(server_rec *, apr_pool_t *);
+
+/* mutex type names for Mutex directive */
+#define SSL_CACHE_MUTEX_TYPE    "ssl-cache"
+#define SSL_STAPLING_CACHE_MUTEX_TYPE "ssl-stapling"
+#define SSL_STAPLING_REFRESH_MUTEX_TYPE "ssl-stapling-refresh"
+
+apr_status_t ssl_die(server_rec *);
+
+/**  Logfile Support  */
+void         ssl_log_ssl_error(const char *, int, int, server_rec *);
+
+/* ssl_log_xerror, ssl_log_cxerror and ssl_log_rxerror are wrappers for the
+ * respective ap_log_*error functions and take a certificate as an
+ * additional argument (whose details are appended to the log message).
+ * The other arguments are interpreted exactly as with their ap_log_*error
+ * counterparts. */
+void ssl_log_xerror(const char *file, int line, int level,
+                    apr_status_t rv, apr_pool_t *p, server_rec *s,
+                    X509 *cert, const char *format, ...)
+    __attribute__((format(printf,8,9)));
+
+void ssl_log_cxerror(const char *file, int line, int level,
+                     apr_status_t rv, conn_rec *c, X509 *cert,
+                     const char *format, ...)
+    __attribute__((format(printf,7,8)));
+
+void ssl_log_rxerror(const char *file, int line, int level,
+                     apr_status_t rv, request_rec *r, X509 *cert,
+                     const char *format, ...)
+    __attribute__((format(printf,7,8)));
+
+#define SSLLOG_MARK              __FILE__,__LINE__
+
+/**  Variables  */
+
+/* Register variables for the lifetime of the process pool 'p'. */
+void         ssl_var_register(apr_pool_t *p);
+char        *ssl_var_lookup(apr_pool_t *, server_rec *, conn_rec *, request_rec *, char *);
+apr_array_header_t *ssl_ext_list(apr_pool_t *p, conn_rec *c, int peer, const char *extension);
+
+void         ssl_var_log_config_register(apr_pool_t *p);
+
+/* Extract SSL_*_DN_* variables into table 't' from SSL object 'ssl',
+ * allocating from 'p': */
+void modssl_var_extract_dns(apr_table_t *t, SSL *ssl, apr_pool_t *p);
+
+/* Extract SSL_*_SAN_* variables (subjectAltName entries) into table 't'
+ * from SSL object 'ssl', allocating from 'p'. */
+void modssl_var_extract_san_entries(apr_table_t *t, SSL *ssl, apr_pool_t *p);
+
+#ifndef OPENSSL_NO_OCSP
+/* Perform OCSP validation of the current cert in the given context.
+ * Returns non-zero on success or zero on failure.  On failure, the
+ * context error code is set. */
+int modssl_verify_ocsp(X509_STORE_CTX *ctx, SSLSrvConfigRec *sc,
+                       server_rec *s, conn_rec *c, apr_pool_t *pool);
+
+/* OCSP helper interface; dispatches the given OCSP request to the
+ * responder at the given URI.  Returns the decoded OCSP response
+ * object, or NULL on error (in which case, errors will have been
+ * logged).  Pool 'p' is used for temporary allocations. */
+OCSP_RESPONSE *modssl_dispatch_ocsp_request(const apr_uri_t *uri,
+                                            apr_interval_time_t timeout,
+                                            OCSP_REQUEST *request,
+                                            conn_rec *c, apr_pool_t *p);
+
+/* Initialize OCSP trusted certificate list */
+void ssl_init_ocsp_certificates(server_rec *s, modssl_ctx_t *mctx);
+
+#endif
+
+#if MODSSL_USE_OPENSSL_PRE_1_1_API
+/* Retrieve DH parameters for given key length.  Return value should
+ * be treated as unmutable, since it is stored in process-global
+ * memory. */
+DH *modssl_get_dh_params(unsigned keylen);
+#endif
+
+/* Returns non-zero if the request was made over SSL/TLS.  If sslconn
+ * is non-NULL and the request is using SSL/TLS, sets *sslconn to the
+ * corresponding SSLConnRec structure for the connection. */
+int modssl_request_is_tls(const request_rec *r, SSLConnRec **sslconn);
+
+int ssl_is_challenge(conn_rec *c, const char *servername, 
+                     X509 **pcert, EVP_PKEY **pkey,
+                    const char **pcert_file, const char **pkey_file);
+
+/* Returns non-zero if the cert/key filename should be handled through
+ * the configured ENGINE. */
+int modssl_is_engine_id(const char *name);
+
+#endif /* SSL_PRIVATE_H */
+/** @} */
+